Make several variable declarations static.

llvm-svn: 50696
diff --git a/llvm/lib/CodeGen/Passes.cpp b/llvm/lib/CodeGen/Passes.cpp
index 6742146..bcd67c50 100644
--- a/llvm/lib/CodeGen/Passes.cpp
+++ b/llvm/lib/CodeGen/Passes.cpp
@@ -31,6 +31,7 @@
 ///
 //===---------------------------------------------------------------------===//
 namespace {
+  static
   cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
           RegisterPassParser<RegisterRegAlloc> >
   RegAlloc("regalloc",